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Table 2
Summary of PIAAN tolerances.
| Parameters | Tolerance | MCMC value | Comment |
|---|---|---|---|
| Wavefront errors | |||
| Tip-tilt | ±0.18 λ/D | – | Jitter, ADC residual |
| Coma | λ/200 RMS | – | |
| XAO residual | λ/75 RMS in 3 cycles | – | |
| PIAA optics | |||
| L1-L2 distance | ±0.30% | – | Can be measured before diamond turning |
| L1-L2 misalignment | ±0.010 Dpupil | ±0.01 Dpupil PTP | Limited by chromatism in rod design |
| Pupil misalignment | ±0.025 Dpupil | ±0.005 Dpupil PTP | Easy to align from PIAA pupil image |
| Pupil magnification | ±0.020 Dpupil | – | Pupil can be redefined at PIAA level |
| Pupil mask to PIAA distance | ±3 cm | ±1 cm PTP | |
| IFU | |||
| fL3 and MLA size | ±5% | 1% RMS | As measured |
| L3 defocus | ±λ/20 RMS | λ/20 RMS | |
| Alignment to PIAA axis | ±0.3 λ/D | – | |
| fMLA and SMF MFD | ±10% | 3% RMS | As measured in Sect. 4.1.1 |
| Near-field alignment | ±0.1 MFD | 0.03 MFD RMS | |
| Far-field alignment | ±1° | 0.06° RMS | As measured in Sect. 4.1.2 |
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